$a$ _ $c c$ _ $b a b$ _ $c a b$ _ $b c$ _ $a b a b$ .

c b a c b

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a b c b c

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b a c a c

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a c b a c

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Solution

The correct option is B $b a c a c$
Here the repeatation is of $a b c c a b$ like
$a b c / c a b / a b c / c a b / a b c / c a b / a b$
Thus, missing letters are $b a c a c$ .
Hence, option C is correct.

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